摘要
应用幼苗分器官涂抹接种的方法,对玉米两个高感自交系进行了丝黑穗病菌侵染部位的精确测定。三年结果一致表明,侵染以胚芽为主,根为次要。在胚芽上,中胚轴的侵染高于胚芽鞘。在根系中,各种根均能侵染,其中以胚根的感染度稍高,但各种不定根和侧根的数量众多,因此在侵染上仍占相当比重。分生区为各器官的有效侵染点,中胚轴的分生区在紧邻胚芽鞘节下,胚芽鞘和中胚轴的相继反复感染,可以导致很高的发病率。出土前的幼龄植株为主要感染阶段,因而决定根系在总体侵染中不居主要地位。扩大对不同抗性的四个自交系和四个单交种作进一步的测定表明,主要侵染器官及其主次关系在不同品种上基本保持与上述高感自交系相同的趋势。对高梁三个高感品种和三个不同抗性的杂交种两年的测定结果看出,高梁丝黑穗病幼苗侵染部位及其主次关系与玉米基本相同,但胚芽鞘和中胚轴的差别不如玉米上明显。
Exact determination of infectious location was carried out in cornseedlings of two highly susceptible inbreds by using the method of rubbingthe teliospores of Sphacelotheca reiliana on different organs of seedlingsindividually.The results of three year′s study revealed that the plumlewas more susceptible than the roots.Of the plumule,the hyp(?)otyl waseven more seriously infected than the coleoptile.As for the root system,all kinds of roots could be infected,the radicle usually had a little higherpercentage of infection,and the numerous adventitious roots were alsoinfected to a certain degree.The effective infectious sites of all organswere proved to be in the meristematic region.The infectious site ofhypocotyl was located beneath the coleoptile node.The successive infe-ction of hypocotyl and coleoptile might lead to the highest disease inci-dence.The younger seedlings before emergence were in the stage of beingvulnerable to attack.This indicated that the roots developed at laterstage were of minor importance in total infection.The results of furtherdetermination of the four inbreds and four hybrids with different resis-tance proved that the main infectious organs and the difference of the in-fectious percentage between them basically showed the same tendency asthe above highly susceptible inbreds.The results of the two year′s research for the three highly susceptiblevarieties and the three different resistant hybrids of sorghum suggestedthat the infectious organs of seedlings and their difference of the infect-ious percentage were similar to those in maize,but the difference of in-fectious percentage between coleoptile and hypocotyl were not so obviousas those in maize.
出处
《植物病理学报》
CAS
1984年第1期17-24,共8页
Acta Phytopathologica Sinica
